Chuck for nut tapping machines



S. BARBER CHUCK FOR NUT TAPPING MACHINES March 14, 1933.

Filed July 25, 1930 4 Sheets-Sheet 1 March 14, 1933. s. BARBER CHUCK FORNUT TAPPING MACHINES 4 Sheets-Sheet 2 54 86 rnian (Barb e 7 Filed July25, 1930 March 14, 1933. s. BARBER 1,901,579

CHUCK FOR NUT TAPPING MACHINES Filed July 25, 1930 4 Sheets-Sheet 4 I r,1 Jhernzarng'i'arber A B W a.

Patented Mar. 14, 1933 P T NT H- E SHERMAN- BARBER, MAY WOOD, ILLINOISCHUCK FOR NUT TAPPING lIIACI-IINES Application filed July 25',

. This invention relates to improvements in a nut tapping device, andrefers particularly to the provision of a chuck for removably holdingthe tap at a plurality of points along y its shank, and means foralternately gripping and releasing the shank at each of said points in apredetermined sequential order.

The utility, objects and advantages of my invention will be apparentfrom the accomp'anying drawings and following detail description.

In the drawings, Fig. 1 is aside elevational view of a nut tappingmachine utilizing my I novel chuck. I

Fig. 2 is. a longitudinal cross-sectional view of the chuck,illustrating the disposition of its various constituent'elements at thecoinpletion of the tapping operation.

Fig. 3 is a detail sectional View of a portion of the. chuck at a periodjust subsequent to that shown in Fig, 2. V

Fig. 4 is a detail sectional elevational view of the nut-gripping arms.1

Fig. 5 is a sectional view of the chuck similar to that shown in Fig. 2at a subsequent period of operation.

Fig.6 is a sectional view of the chuck taken at right-angles to thoseshown in Figs.

r and 5.

Fig. 7 is a transverse sectional view taken on line 77 of Fig. 2. Fig. 8is a transverse sectional view taken on line 8-8 of Fig. 2. Fig. 9 is asectional view taken on line 9--9 I of Fig. 2. I

n have mounted thereon a bevel gear 1 which may mesh with a co-operatingbevel gear 5 mounted upon stub shaft 6. Shaft 6 may be journ al led inbearing 7 and may have mounted intermediate its length pinion 8 whichmay .mesh with spur ,gear 9. A spindle ,10 may be j ournalled in frame 1at 11 and may 1930. Serial No. Maser. 5

be free to both rotate and slide in a vertica;1 direction. Spindle maybe provided inter mediate its length with slot 12in which a pin (notshown)v attached to spur gear 9 is adapt 7 ed to be disposed, theairangement being such 55 that the spur gear 9 and spindle 10 will revolveas a uni-t and upon vertical motion of. the spindle 10 the spur gearwill be maintained in a fixed horizontal plane by means ofthe-bearings'13 and 14, which may be mounted upon frame 1. 5

A lever 15 may be f lcrumed at the pivot point 16upon frame 1,, one endof said lever being provided with a handle 17 A collar 18 mayberigidlymounted upon spindle, 10 and by means of a conventional yokelever 15 may be pivotally attached thereto intermediate the handle 17and the'fulcrum 16. a To compensate for angularity, slot 19 inay be Iprovided in lever 15. A second lever 20 may 79 be fulcrumed intermediateits lengthpas at 21, upon-base 2 and may be provided atfone end thereofwith apedal 22. The opposite end of lever20 may be pivotally connectedto link 23 at 24, the other extremity of link 23 being pivotallyattached .to lever intermediate fulcrum 1'6 and handle'17, as at 25.

A counter-weight 26 may be movably po- Sitioned upon the end of lever 15on theflopposite side of thefulcrum 16 from" handle 17 I and maybeprovided with setscrew 27 by which means Weight 26 may be maintained ina fixed position upon the end of lever 15. The lower portion of weight26 may be provided with a lug 28 which in turn maybe provided with aplurality of holes 29. A link 80 may be pivotally "connected tothe lug28 at the lower portion of weight 26, and the 7 point of pivotalconnection therebetween may be arbitrarily'set at anyone of theholes 029. The opposite end oflever 30 maybe provided with a slot 31 in whicha-pin 32 may be disposed said pin being connected to one "end of lever33. A chuck 34 may be mounted upon the lower end of spindle 10 means ofpin 35, shown bestin Figs. 2 and 5 ,"said chuck being adaptedto retain atap in operative position. Q 1

' A band 37 maybe positioned upon'the out side of chuck 3 1 and may belongitudinally rotated about fulcrum 16 in a clock-wise direc slidablethereon, the range of said slidability being determined by the length ofslots 38 provided in lateral walls of said chuck. A yoke 39 may be,rigidly mounted upon band 37 and may be provided with upper and lowerflanges and 41, respectively. An annular ring 42 may be rotatablydisposed between flanges 40 and 41 and may be fastened at diametricallyopposite sides to bifurcated arm 43, which forms one extremity of thelever 33. Lever 33 may be fulcrumed at 44, which is one extremity ofconnecting link 45, the opposite end of link being pivotally mountedupon bracket 46, which in turn may I pin 60 may be disposed withinmember 56 and be fixedly mounted upon frame 1.

' It can readily be seen that by the mechanism herein described thatupon downward motion-oi the spindle 10 chuck 34, and hence tap 36, willbe lowered. This downward motion of these various mechanisms may bebrought about by pulling. downwardly, on handle 17. In either caseweight 26 will be tion. As weight raises slot 31 at the lower end oflink 30 will pass around pin 32 until the lower end of said slotcontacts said pin. At this period one end of lever 33 will beraised,whereas the opposite end will be lowered, that is, the end whichis connected to yoke 39. The arrangement is such that upon initialdownward movement of spindle 10 yoke 39 will remain in a fixedhorizontal position and by means of slot 31 an element of i lost motionwill exist in the'system of link brought out.

agesn When the lower portion of slot 31 contacts pin 32 yoke 39 willdescend with the remaining 'descentof spindle 16, but because oftheratio of the lengths of the various lever arms hereinbefore describedsaid yoke will descend at a greater rate than that of the spindle 10.The purpose of this differential movement will be hereinafter more fullydescribed. p

Chuck 34 may comprise a body of substantially rectangular cross-sectionhaving walls 47, 48, 49 and 50; It is to be understood, of

course, that the chuck body may take any desired cross-section, forinstance it may be oblong, circular, or may be of any desirable ir--regularv section. As hereinbefore stated chuck 34" is adapted to retaintap 36 in operative position. Said tap may take the form of the usualtapper tap having 'a relatively long shank 51 which may be substantiallycircular in cross-section. As a feature of my invention, the shank 51may be square intermediate its length, as at 52. The

shank 51 may also be squared at its upper end 53. The purpose'of thisvariation in crosssection will be hereinafter more fully lhe shank 51may be retained within chuck body 34 by means of sets of jaws 54 and 55which engage the upper and intermediate squared portions of the shank51, respectively. Referring particularly to Figs. 2 and 8, the lower setof jaws 55 may comprise grip,- ping members 56 and 57 which may bepivoted, respectively, on opposite sides oif the inner portion of thechuck 34, as at 57' and 58. The

members 56 and 57 are normally positioned a gripping position by meansof coil springs 59 associated with each of said members.

maybe spring actuated, as shown best-at '61 in F 1g. 8, the outerendotsaid pin protruding beyond the gripping-edge of said member 7 andbeing ad'aptedto register withanotch 62 formed in one side of shank 51.7 To further maintain lower jaws 56 and 57 inoperative contact-with thesquared portion 52 of shank 51 the end 63 of lug 64 pivoted at 65 andactu ated inwardly by spring 66 may bemaintamed in contact with theupper faces of each of the members 56 and 57.

Referring particularly to Figs. 2 and 7, the

upper set of jaws 54 may comprise two pivot:

ally mounted co-operating members 67 and 68 inner portion of chuck 34,as at 6 9 and 70. Members 67 and 68 may be nor1nally disposed at rightangles to the length of the shank51 portion 53 of said shank. 68 may bemaintained in normaloperative po sition by means of springs 71. V v

inasmuch as members 56 and 57 comprisand '68 comprising the upper set 54are adap ed to swing upwardly. the lines of demarcation between thesquare sections 52 and 53 of the shank 51 and the circular sectionthereof assume the form of curvilinear lines 72 and r 72. By thisfeature themembers comprising thetwo sets of jaws may freely swing intoand'out of contact with the shank 51:.

Two bars 73 of similar construction may be mounted, respectively,uponeach side of the mounted upon band 37 which encompasses the outersurface of chuck 34 and may be connected to said band by means of screwsorthe like 74. said screws nassingthrough each of the slots 38. Bars 73may bedisposed longis tudinally within chuck body 34 and may be adaptedto slide longitudinally therein with the motion of the yoke mechanism39. The

upper portions of each of the bars 73 may be joined by a spacer 75,which may be attached 1 to each of the bars by screws or the like 7 6.Fingers 77 may be pivotally mounted upon the ends of the bars 73, as at78, and may be normally extended inwardly by means, of'leaf springs 79.The function andoperation of ingthe lower set of aw's 55, and members 67r1 I tan'eously with this map ing:

bar's- 73 and fingers 77" will-be hereinafter =mofe f-ullydesc'ribed. W1 v i operation,shaft 3unay be "rotatedby'any s'uitable prime- Inoiie'r"(*ncstshowny', whiclirogear trains hereinbefor'e"described to f spitdle 10. A chute' '80 may 'befinountedadfac'ent g 1 frame 1" and may be"adapted to discharge blank nuts' 82' in sequence to a wvren'clior stop81*positi'o11'ed upon platform '83 imrhediat'ely below the "position"ofth frotating'l? tap :36. -Platform-83 ma'y 'b'e apertured, asat84,"below the position of one of the nuts-82 heldb the stop 81. Handle"17 'may be? pulleddowm -spiindle 16 willbeacc'ompa'nied by downward Asboth the 3 01:9 39andspindleflescend si1nultaneously,"b'ars 73 fastenedtdsaid joke 3, will move longitudinally "downwardly relal tive to "chuck34:. Normally bars' '7 3' areenti'rely housed withinlthe'body 'ofth yoke34,

-3 but upon this-above"mentioned frela'tive m f -tiorrbetween said*barsand the chii'cklbodj the lower -portion of said bars containin theswingablymounted'fin'gers 77 will pass downwardly through apertures 86providedf 'be tween walls LT' and 48 and upper j aws 67 and 68;respectively. 1 Upon passing through said -apertures, fingers 7 Tarerotated upwardly -aiga;inst the tensionof springs 79. bars 73continue-to descend the "lower end of one of i -said-bars-will contactthe edge of lug'64 and will I rotate same in ''-a "clock-wise" direction:againstthe impelling force of s ring "66. 'Upjon furthefdescentofthe"bars 7 3 the ends of the same'pass through ap'e r'tures 87] pro- 1videdbetween-walls'47 and '4 8 an'd' the lower jaws 56 and 57 =At thisperiod'thelower ends of bars 7 3 protrude below the lower portion ;-andsaid-bars continue-to descend ilntil their E lowere'nds occupya-positiona relatively'short distanee from the upper portion of thewrench or "stop 81'. i --At-thisiperiod tap 36 ill'hate passed'entirelythrou gh aperture 85 of the blank nut 82,the;rel'ative-positionsof'thevfari'ous' mechanisms being shown best'inFi'g; g

'A support 88 -may be mounted. upon the upperTportion '89 of frame 1 and'ni'ay be adapted to serve as a mounting means for'bell crank lever.:90. A threaded nie'lnbei" 91 may 'n 'ounted'uponthe upper' end and aff921 y be m uned'imme ie below s aid member. The upper endeafi bellcrank lei er 90 disposed in'conta'ct with laiich 94c which may bevslidabl e lrelatiyej to 'guide' means 95, one end of said latch teri'nieatinin a pin 96 which upon depression-of thelower end'97fof bell crank lever90 will be tn;agile into fre'g'istration wit ens er; the threads 98ofrnernber'9l. It isito beunderstood; of course, that this' mechanism isentirely c'oni entional and forms no part of'i'ny "inventive concept.

. When the tap 36 through nut '82 and the chuck mechanismsoccupythepositions shown 'in Fig. 2, collar "92 will ha'Vedes cendedinto Contact with 197 o fbell crank lever 90 thereby shifting lateh 94toward member 91 and engaging pin 9'6 i I one ofthethreads 98. As thespindle continues to rotate,"due to the engagement of the 'p'inee andthreads 98 the spindle lO willg-be raised, "raising chuck 34 and tap 36.iAs the spindle "raises 'collar 18 will also tscenjd'therebydep-re's'sing weight 26 andp'ermitting link 30 to descend.Inasmuch as pin 32' at 'tliis'period maybe in contactwith'the lowerportion ofslot 31'1ink 30 will descend without has passed entirely 1affecting the position of lever 33. In other word's,"as tap 36 ascends,bars 73 and fingers '7 7 remain for a relatively short period 'of'tinie,dependingu'p'on th'e length of slot 31, 'inthe'ir lowermost position asdetermined stop '99, As tap 36 rises, the nut whichfhas been tapped iscarried upon theupp erend of I 'saidtap nntilsa'id nut contacts thelower in- 'cline'd s'ideslof fingers 77. Upon'furtheras cent'of tl1etap'36 said nut maybe carried bov'ethe upper portion 01; fing r 77,whefe; ponxsav'idfingers actuated y Fringe? 9 may snapinwardlylbelow'the lower surface ofthe nut. This period of operation isshown'best 'in FIgsS'andL "At this period the upper portion j'of 'slo t81in link 30 ma contact pin SQand may de- 1 press that endof lever 33.A's sp'indl e 10 con tinuesits 'ascentpin 32 will be further depres'sed,and"hence yoke 39 will beraised and inasmuch as the speedoftravel of tlie yoke is swifter'than the speed of traiiellof the spindlerelative motion between bars 7 3 "and chuck 34 will exist, As spindle 10continues to raise, fingers 77 holding nut '82 will draw said nutupwardly-from the top of tap 36 and will carry same up 'trcuy along thel sham n until said nut camera the lower set'of jaws 55, and inasmuch asdog 64 will beln'aintained in 'its rotated position against the'i'm'p'elli'ng force of spring 66fineiribers t r 56' and 57 may berotated upwardly against the tension of'springs 59, thereby permittingfingers 77 ancl'nut 82 to pass upwardly by the wwe 'settf-jtws. Duringthis operation'the sl1ank"51*'0f the tap 186 is retained inf' chu ck 34byTtHe'upP-er set'of jaws 54. VVh'en fingers 54 and will rotate themupwardly against.

7 7 and nut 82 pass the lower jaws 55 the same will return to normalposition in contact with.

the square pelling forcev of springs 59. At this period. nut 82encircles that portion ofshank .51.

included between jaws 54 and 55 and both.- javvs will be in operativeposition in contact;

.' 'As the'membersfi? and 68 comprising the: I

upper jaws 54 are rotatedupwardly by the passage of the nut, member 68contactsthe- 7 lower end 100 of bar 101 which may be piv-- otallymounted at its opposite. end at 102 and swings' said bar against thecompression of spring 103 to the position shown in full. 7

1 1 pwardly along'the shank of the tap and 'lines in Fig. 5. A lug 104may be formed "adjacent the lowerend of barv 101: and when.

nut 82 is raised above the-extreme upward.

position of members 67 and 68 said members- Willreturn to their normal13091131011111 con-- tact with the squared portion 53 of the upper endof shank 51. Simultaneouslywith the re,-- .turn of the members 6? and 68to normal po-- sition bar 101will swing inwardly, being im-- polled byspring 103, and lug 104 Wlll deliver an impacting force to nut 82 heldupon, theupper portion of fingers 77. Th1soper-- ation is clearly shownin dottedlines at 105- .i'n,Fig.5. v

Nut 82 upon being iitby lug 104w1ll be ejected through aperture 106providedun the. side of the body of the chuck 34. Ahopper ,or guard 107may be mountedv upon frame 1 by means of bracket 108 and-the upper end.thereof may surround a portion or" chuck 34.. VVhennut 82"is ejectedfrom said chuck the: same will fall to the lower surface 109 of hopper107 and may bedeliveredthrough spout 110 to any desirable receptacle(not shown). To prevent the-ejected nut from.

I falling between chuck 34 and the aperture- 111 provided in hopper 107,acollar or de-- fleeting means 112 may be disposed upwardly from thesurface 109 of saidhopper and may surround the rotating chuck 34.

7 It is apparent that herein is provided a chuck 'for a nut tappingmachine which is susceptible of automatic or semi-automat c operation.The blank nuts may be automatica-lly fed to the machine by conventionalfeed means (not shown)v which are famil ar to 1 those skilled in theart. When the chuck 3.4 and yoke 39 have reach-ed their uppermostpositions, pin 96 may disengage from threads 98, permitting spindle 10,by a suitable dis-1 position of weight 26 upon lever arm 15, to descendthus positioning' tap 36in operative position with respect to anotherblank nut 1 82. Bysuitable selection of the weight 26 portion 52 or"shank 51-bythe im- 1 retained by the y openablejaws disposed jidownwardly,

and means for .wardly, each setof :sufiicient downward-pressure mayexist upon 7 caused in the eifectivelength of link '30'may saidzlink atI ibe "compensated by connecting :a: diflierent aperture 29 in lug 28. aaware that many modifications'of my 3 -:.deVIce'may-bemade and manydetails of con- :rs'truction changed without departing .from

tthe spirit of my invention, hence I do not swish to be limited exceptas necessitated by Tithe prior art.

, I claim as my invention:

1.. In combination, ping machine which comprises, a body, means :forrotatingsaid body, a plurality of sets of openable jaws disposed in saidbody for holding the shank of a tap with the threaded porrtionvdownwardly, and means for moving a ithreadednut fromgth'e upperportion'of the successively opening rof aws.

, -plng machine which comprises, a body, means tfor rotating'said body,a plurality of sets of with its threaded end means for moving a threadednut from the upper portionof the tap along .ing the shank of a tap .theshank of the tap and successively opening :andc os1ng each set of aws,said latter means comprising a-plur'ality ofbars slidably disjposedfwithin said body, finger positioned at one endof each of said bars,-andmeans for moving said bars longitudinallyat a differential speedwithrespect to said body.

3. In combination, a chuck for a'nut tap- V gplng machine whichcomprises, a body, means a plurality of sets of :tor rotatingsaid body,

jaws disposed in said body for holdingthe gs'hankof a tap with itsthreaded end down- .wvardly,:each set of jaws. comprisingap'air ofswlngably mounted gripping-members,

the shank lof-the tap and successively alternatelyswinging the grippingmembers into ping members,'a plurality of bars slidably associatedwithsaid'lbody, a spring'actuated finger positioned .at one'end of eachofsa-id bars for f'raising a completely threaded nut from the top ofthe.tap upwardly along'the shank of said tap, thereby successively swing achuck for a nuttapinsaid body'forhold a :spring actuated" positivelyraising a threaded nut from theupperiportion of the ta along apluralityof sets of ing said gripping members alternately into and out ofoperative contact with the tap shank.

5. In combination, a chuck for a nut tapping machine whichoomprises, abody, means for rotating said body, a plurality of sets of openable jawsdisposed in said body for bolding the shank of a tap with its threadedend downwardly, means for moving a threaded nut from the upper portionof the tap upwardly along the shank of the tap successively opening andclosing each set of jaws, and means intermediate said body for ejectingthe threaded nut from the body.

6. In combination, a chuck for a nut tapping machine which comprises, abody, means for rotating said body, a plurality of sets of openable jawsdisposed in said body for holding the shank of a tap with its threadedportion downwardly, means for moving a thread ed nut from the upperportion of the tap along the shank of the tap successively opening andclosing each set of jaws, and means for ejecting the threaded nut fromthe body, comprising a spring actuated ram which is set by the openingof the last set of jaws and released by their closing.

7 In combination, a chuck for a nut tapping machine which comprises, abody, means for rotating said body, a plurality of sets of openable jawsdisposed in said body for holding the shank of a tap with its threadedend downwardly, means ior moving a threaded nut from the upper portionof the tap along the shank of the tap successively opening and closingeach set of jaws, means for ejecting the threaded nut from the body,comprising a spring actuated ram which is set by the opening of the lastset of jaws and released by their closing, and means for retrieving saidejected nut comprising a hopper surrounding said chuck body and spacedtherefrom.

In testimony whereof I aflix my signature.

SHERMAN BARBER.

